What my sister and I pack, in order of importance:
1. Books we have read and remember fondly;
2. Books we read in childhood;
3. Books we remember seeing on the shelves for so long a time we might as well have read them;
4. Books we might read some day, maybe;
5. Books that would be cool to keep - history, philosophy, poetry, novels by authors who seem vaguely familiar, and anything that looks old;
6. Books by the same author (either someone in the house must like the author or the library had a lot of surplus books by that author at the sale);
7. Books we feel sorry for.
What my father packs:
1. Everything we didn't.